摘要:
The present invention provides a retractable door apparatus for trailer trucks including at least two tracks of extruded aluminum each having at least one guide surface with a wear resistant coating; and a door in slideable engagement to the guide surfaces of each track. The wear resistant coating may include a self fluxing alloy, oxide, carbide, Al bronze alloy, or cermet having a hardness greater than aluminum. The present invention also provides a method of forming the tracks for the sliding or rolling door apparatus including the steps of providing an aluminum extrusion having at least one guide surface with a geometry for accepting a roller bearing or rollers; and forming the wear resistant coating on the guide surfaces at a temperature that does not substantially reduce the mechanical properties of the aluminum extrusion.
摘要:
A system and method that includes, in an embodiment, a prism, a camera, a light source, and a plate. The system, in an embodiment, is configured for scanning a roll and generating an image of the roll surface. The prism, in an embodiment, is positioned below the camera and above the plate. In an embodiment, the plate is positioned below the prism and above the roll surface. In an embodiment, the light source is positioned above the prism. In an embodiment, the light source and the prism are positioned to provide light to the roll surface at an angle of at least 75 degrees measured from a line normal to the roll surface. In an embodiment, the prism is configured to refract light from the light source, the camera is a line scan camera that includes a row of pixel sensors, and the light source includes light emitting diodes.
摘要:
An ultrasonic inspection system is used to inspect grinding wheels used to prepare work rolls used in metal sheet production. The grinding wheel inspection system includes a test stand adapted to rotatably support a grinding wheel. An ultrasonic transmitting and receiving apparatus passes sound waves through the body of the grinding wheel. The attenuation of the sound waves passed through the grinding wheel is recorded in a recording device and analyzed in a computer. The recording device, which may be the computer, preferably records amplitude attenuation of the sound waves. The computer analyzes the amplitude attenuation, records the amplitude attenuation as an indicated density profile, and displays the indicated density profile on a computer screen for inspection. The indicated density profile of the inspected grinding wheel may be compared with indicated density profiles of other grinding wheels, particularly those with known operational characteristics.
摘要:
Steel tooling for die-casting low iron content aluminum alloys is surface treated with a layer of CrN applied to a thickness of at least 4 microns, and preferably 5-10 microns, by physical vapor deposition (PVD), and preferably a steered are evaporation PVD process. The CrN protects the steel tooling from dissolution and erosion by the highly active molten aluminum.
摘要:
A system and method that includes, in an embodiment, a prism, a camera, a light source, and a plate. The system, in an embodiment, is configured for scanning a roll and generating an image of the roll surface. The prism, in an embodiment, is positioned below the camera and above the plate. In an embodiment, the plate is positioned below the prism and above the roll surface. In an embodiment, the light source is positioned above the prism. In an embodiment, the light source and the prism are positioned to provide light to the roll surface at an angle of at least 75 degrees measured from a line normal to the roll surface. In an embodiment, the prism is configured to refract light from the light source, the camera is a line scan camera that includes a row of pixel sensors, and the light source includes light emitting diodes.